Gravitational and tectonic stress states within a deep-seated gravitational slope deformation near the seismogenic Periadriatic Line fault

Baroň, Ivo; Sokol, Ľuboš; Melichar, Rostislav; Plan, Lukas

doi:10.1016/j.enggeo.2019.105284

Cited by 13 publications

(3 citation statements)

References 38 publications

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“…So far there is not enough data from caves to unequivocally state whether the displacements are co-seismic or creep or a mixture of both. The present-day kinematic behavior of active faults in the Eastern Alps reveals a variety of different displacement modes at the micrometer level 29 and associated near-surface crustal stress variations 35 due to interplaying tectonic crustal processes and gravitational relaxation 36 . The macroscopic observation shows mm to cm-scale present-day co-seismic displacements resulting in speleothems damage, as observed after the 2017 Mw 6.6 Bodrum–Kos earthquake in Greece 18 or in Obir Cave where the 1976 Mw 6.7 Friuli earthquake dislocated dripstone column 17 .…”

Section: Discussionmentioning

confidence: 99%

Post-Miocene tectonics of the Northern Calcareous Alps

Szczygieł

Baroň

Melichar

et al. 2022

Sci Rep

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The Late Cretaceous orogeny followed by the Eocene collision of the Adriatic with the European plate dissected the Northern Calcareous Alps (NCA) by a number of well-studied strike-slip fault systems accommodating N-S shortening and E-W stretching. However, the post-Miocene fault activity is poorly constrained due to lack of Neogene faulted sediments, and glacial erosion of geomorphic indicators. Using the protected environment of caves, we fill the knowledge gap in the post-Miocene evolution of the NCA by paleostress analysis of 172 reactivated faults that offset passages in 28 caves near major faults. Constrained maximum age of caves, our results indicate that the NCA have been subjected to N to NE trending compression since Pliocene. Faulted speleothems dated with 230Th/U method, indicate that the recorded present-day stress state did not significantly change during the last 0.5 Ma. In contrast to the previously proposed post-Miocene N-S extension of NCA, but in agreement with what was observed in Vienna and Pannonian basins, we conclude that the eastward extrusion resulting from N-S convergence has continued despite a distinct slowdown of plate tectonic velocities in the late Miocene. The N-S extension affected only the Alpine front during Pliocene Molasse basin inversion, while at the scale of the Alpine orogen the NCA underwent successive N-S shortening and E-W stretching.

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Section: Discussionmentioning

confidence: 99%

Post-Miocene tectonics of the Northern Calcareous Alps

Szczygieł

Baroň

Melichar

et al. 2022

Sci Rep

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“…However, there are tectonic fractures that are distinguished from the diagenetic and natural fractures widely distributed within these coal-bearing basins, and this phenomenon is more remarkable near the orogen-basin transition zone [15][16][17][18][19][20][21]. The formation of tectonic fractures has been associated with convergence actions close to or even far away from strike-slip faults and transpressional structures [18,22]. In other words, where there was structural convergence, there was compression and torsion (C-T) action because convergence is usually asymmetric [23,24].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Compression and Torsion Fracture within 3D Printed Cementation-Weak and Porosity-High Sandstones

et al. 2023

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Cretaceous sandstones have weak cementation and high porosity while exhibit a high apparent brittleness. Compression and torsion (C-T) fractures are widely distributed in Cretaceous sandstones due to asymmetric tectonic convergence action. However, studies on C-T fracture formation and the mechanisms causing variability in Cretaceous sandstones containing no oil or gas are rare due to the challenges in sampling intact sandstone cores, despite their significance to mine shaft sinking. Therefore, this study used binder jetting-based 3D printing to prepare artificial Cretaceous sandstone and developed a real-time X-ray computed tomography- (CT-) aided torsion shear apparatus to test them. The test results showed that the 3D printed (3DP) sandstone had characteristic indexes that approached and even exceeded the lower limits of Cretaceous sandstone cores, thereby accurately representing the unavailable cores. Furthermore, the 3DP sandstones had anisotropic properties comparable to the sandstone cores. Under C-T action, the 3DP sandstone exhibited a pronounced strain gradient of 2.0 %/mm perpendicular to fracture inclination. The inclination angles of fractures formed under C-T action tended to increase as the cell pressure increased, and that approached the orientation angles of maximal principal stress. The maximal and minimal principal stresses exerted inclination-slip and width-stretching effects, respectively, on C-T fractures. But the effect of inclination-slip on the C-T fractures was stronger than that of width-stretching. This insight into C-T fracture formation will guide future studies on the fracture evolution and its disaster-dominating mechanisms arisen from disturbances by shaft sinking.

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“…[1][2][3][4]) and external forces (regional tectonic stress, hydraulic seepage, seismic action, human disturbance, etc. [5][6][7][8]). Among these factors, the slope shape is a direct reflection of the geometric characteristics of slopes, and its influence on slope stability has important research significance.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Influence of Profile Shape on the Stability of a Nonhomogeneous Slope

Yang

Shang

Liu

et al. 2021

Advances in Civil Engineering

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To study the influence of profile shape on the stability of nonhomogeneous slopes, strip mechanical models of slopes with different profile shapes were established following the simplified Bishop method. Three hundred and seventy slope models with different profile shapes and strata sequences were simulated and analyzed with FLAC3D. The results show that slopes with weaker-to-stronger (WtS) strata sequences are, in most cases, more stable than slopes with stronger-to-weaker (StW) strata sequences when all other conditions are the same. Slopes with linear shapes are the most stable. With increasing arch height, the stability of convex slopes decreases, and the stability of concave slopes first increases slightly and then decreases. When the strata sequences are WtS, the factors of safety (FoSs) of slopes with convex and exterior polyline shapes decrease more slowly. However, when the strata sequences are StW, the FoSs of slopes with concave and interior polyline shapes decrease more slowly. The greatest X-displacements are concentrated in the steeper areas of the slopes. For different strata sequences, the higher the rock strength at the steeper position is, the more stable the slope is, and the opposite trend is also observed. For the same strata sequence, the stability of a polyline-shaped slope is always better than that of a curved slope with the same inflection point.

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Gravitational and tectonic stress states within a deep-seated gravitational slope deformation near the seismogenic Periadriatic Line fault

Cited by 13 publications

References 38 publications

Post-Miocene tectonics of the Northern Calcareous Alps

Post-Miocene tectonics of the Northern Calcareous Alps

Experimental Study on Compression and Torsion Fracture within 3D Printed Cementation-Weak and Porosity-High Sandstones

Numerical Study on the Influence of Profile Shape on the Stability of a Nonhomogeneous Slope

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